gtk: Show page action popup bubbles.
gtk: Show page action popup bubbles.

Focus is a bit weird within these; I suspect that it's the same
with the browser action bubbles.  It looks like the same issue that
the bookmark bubble had: the bubble grabs the pointer; when a
widget within it (e.g. combobox) gets clicked it steals the grab;
when it ungrabs it the grab is released instead of being
transferred back to the bubble.  Unsure of what the correct fix
is for this.

BUG=28061
TEST=installed two separate extensions with page action popups and clicked on their icons

Review URL: http://codereview.chromium.org/412001

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@32547 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser